swift234

[Sema] Minimum access for protocol requirement members to 'fileprivate'.

It used to be `internal`.

// ModA/File1.swift
private protocol P  {
  func privMethod() // This was implicitly `internal`.
}
public class C {
  public init() {}
  fileprivate func privMethod() {
    print("FOOBAR")
  }
}

// ModA/File2.swift
extension C {
  public func callPrivMethod() {
    // This should be "error: use of unresolved identifier 'foo'",
    // but was not.
    privMethod()
  }
}

// main.swift
// This ends up runtime error 'fatal error: : call of deleted method'
C().callPrivMethod()